Set top box



FIG. 1 is a top front perspective view of a set top box showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view, the right side being symmetrical thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view. 

The ornamental design for a set top box, as shown and described. 